I'm in the Sacramento area, but I have no experience with renting greenhouses. Being close to Sacramento can mean you are in one of a half dozen counties. That matters because (sadly or not depending on your viewpoint) the highest rent you will get for the greenhouses will probably be for cannabis cultivation. Permanent indoor structures (especially where the facility is connected to a community sewer system) have great advantages for permitting cultivation activities. However, Proposition 64, which legalized many cultivation activities allows local agencies to impose additional requirements or outright bans. Some counties or cities have banned any commercial cultivation activities. There are numerous other rules regarding proximity to schools, etc. that may also be relevant, and the state has established a draconian permitting process that reportedly extracts such high fees that many growers have abandoned the legal process and returned to illegal cultivation.
I would imagine that if you were to obtain the cultivation permits and lease the facility as a turn-key grow facility, the rent would be much higher. There are a lot of listings online. Try Googling "cannabis greenhouse for rent" or "420 property," that sort of thing. You'll find a lot of offers. The State offers permitting assistance at:
https://cannabis.ca.gov/
I am not in the cannabis business, nor am I a promoter, but I am familiar with permitting rules in California. I hope this post isn't against any forum rules. I'm still a rookie around here.